( Creating Guile Modules

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 31.3.3 Creating Guile Modules
 When you want to create your own modules, you have to take the following
    * Create a Scheme source file and add all variables and procedures
      you wish to export, or which are required by the exported
    * Add a `define-module' form at the beginning.
    * Export all bindings which should be in the public interface, either
      by using `define-public' or `export' (both documented below).
  -- syntax: define-module module-name [options ...]
      MODULE-NAME is of the form `(hierarchy file)'.  One example of
      this is
           (define-module (ice-9 popen))
      `define-module' makes this module available to Guile programs under
      the given MODULE-NAME.
      The OPTIONS are keyword/value pairs which specify more about the
      defined module.  The recognized options and their meaning is shown
      in the following table.
           Equivalent to a `(use-modules INTERFACE-SPECIFICATION)'
           ( Using Guile Modules).
     `#:use-syntax MODULE'
           Use MODULE when loading the currently defined module, and
           install it as the syntax transformer.
     `#:autoload MODULE SYMBOL'
           Load MODULE whenever SYMBOL is accessed.
     `#:export LIST'
           Export all identifiers in LIST, which must be a list of
           symbols.  This is equivalent to `(export LIST)' in the module
           Tell Guile not to record information for procedure backtraces
           when executing the procedures in this module.
           Create a "pure" module, that is a module which does not
           contain any of the standard procedure bindings except for the
           syntax forms.  This is useful if you want to create "safe"
           modules, that is modules which do not know anything about
           dangerous procedures.
  -- syntax: export variable ...
      Add all VARIABLEs (which must be symbols) to the list of exported
      bindings of the current module.
  -- syntax: define-public ...
      Equivalent to `(begin (define foo ...) (export foo))'.
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